SMC_SmoothBSpline (FB)¶

FUNCTION_BLOCK FINAL SMC_SmoothBSpline

Smoothes segments of consecutive G1 elements with a B-Spline of fifth degree. Each segment of at least 5 consecutive G1 elements of non-zero length is replaced by splines. The start and end positions of the G1 elements serve as control points of the B-spline that is created. Only the start position of the segment and the end position are interpolated exactly.

Each segment of n >= 5 G1 elements is replaced by n-5 polynomials.

Note

Does not support H-functions
Does not support changes of flags like G51, G52, G40 and so on, these changes are ignored
Requires 3D-Mode
Can be turned on and off from G-Code using G38/G39
A spline always contains the same tool correction information (i.e. lengths and diameter) as the first of the segments that it replaces.
Elements other than G1 (e.g. G0, G2, G3, …) interrupt the smoothing until the next G1 element.

Additional axis: First the values of the additional axis are also converted to a B-spline. For the linear axis (P,Q,U,V,W) only the positions at the end of each polynomial are stored in SMC_GeoInfo. For the smoothed axis (A, B, C) the slope is also stored.

InOut:

Scope	Name	Type	Comment
Input	`bExecute`	`BOOL`	Execution starts on the rising edge.
	`poqDataIn`	POINTER TO SMC_OUTQUEUE	Input path queue
	`nSizeOutQueue`	`UDINT`	Size of the data buffer `pbyBufferOutQueue` in bytes.
	`pbyBufferOutQueue`	POINTER TO ARRAY [0..0] OF SMC_GEOINFO	Points to the first byte of the memory area being allocated for the SMC_OUTQUEUE-structure. This area must be at least as big as defined in `nSizeOutQueue`. Typically the allocation of the memory buffer is done within the declaration part of the IEC-program by defining an array of SMC_GeoInfo (ExampleBuf: `ARRAY[1..50] OF SMC_GEOINFO` for a buffer which can hold 50 path` elements). After predefining the value it may be modified during a reset only.
	`eMode`	SMC_SMOOTHBSPLINE_MODE	The element type applied for the smoothing of the axes.
	`wFeatureFlag`	`WORD`	The feature bit (0..31) used for smoothing (controlled by G38/G39)
Output	`bDone`	`BOOL`	Will be set to `TRUE` as soon as the input data from `poqDataIn` has been processed completely. Afterwards, the function block will not perform any further actions until it gets reset. If the `bExecute` input is `FALSE`, bDone will be reset to `FALSE`.
	`bBusy`	`BOOL`	`TRUE`, while execution of function block is not finished.
	`bError`	`BOOL`	Signals, that an error has occurred within the function block.
	`wErrorID`	`SMC_ERROR`	Error identification.
	`poqDataOut`	POINTER TO SMC_OUTQUEUE	The queue for the output path

Structure:

DoBeforeLeave (Action)